A device and method of operating the device for automatically creating photos or videos of a certain moment are provided. The method includes obtaining a plurality of image frames sequentially captured through a camera for a preset time interval; detecting at least one image frame among the plurality of image frames in which a main object corresponding to a preset main object or an action of the main object corresponding to a preset action is recognized; determining a type of composition of the at least one image frame; cropping a region including the main object from the at least one image frame based on placement of objects in the at least one image frame and the determined type of composition; and creating the photo using the cropped region.